Good luck with this! I completed the national Dex back in 5th gen, which took a loooooooong time, but it was very satisfying. When sixth gen came around, getting all the new Pokemon was pretty easy due to the smaller number of them.
It also took several hours to make a "living Pokedex" in my Pokemon Bank, but I did it! By the way, if anyone needs help with certain Pokemon, I can help as best as I can. That includes event legends.

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